With the mic unplugged radio seems to be okay. It receives. As soon as as the mic plug is inserted the TX indicator comes on. Yes, bad PTT is the obvious answer.

I was hoping someone would chime in with a "Oh that happened to me and all you have to do is refrangle the franzimater and woggle the whozits." After all this thing is mostly a microcomputer with a little bit of radio attached.

Without trying to sound like a smartass or call you down, have you tried tracing the connections on the board itself? I know it isn't easy to do, but that is probably the only way to find the problem--unless you buy another mike. The problem should be simple to find--if you've got magnifying eyes, that is! ;-)

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